For screen lock settings see Lock screen options.
In this section:
Add or remove a PIN lock to the SIM card that is currently in the device.
Controls whether passwords typed into your Android device should be visible on the screen.
Configure which special apps are allowed to have greater-than-normal overall access to your device.
Enable or disable the ability to install apps that come from unknown sources, such as sources other than Google's Play Store.
Controls whether to check with Google to see if an app may be harmful before installing an app.
Lists the certificate authority (CA) companies that this device regards as "trusted", and allows you to mark one or more as not trusted.
Allows the installation of a security certificate, such as a trusted Certificate Authority certificate, from a file stored on your phone's storage.
Allows the quick removal of all user-installed trusted credentials from the device.